/*
 * *****************************************************************************
 * * Copyright (c) 2006-2012 XMind Ltd. and others. This file is a part of XMind
 * 3. XMind releases 3 and above are dual-licensed under the Eclipse Public
 * License (EPL), which is available at
 * http://www.eclipse.org/legal/epl-v10.html and the GNU Lesser General Public
 * License (LGPL), which is available at http://www.gnu.org/licenses/lgpl.html
 * See http://www.xmind.net/license.html for details. Contributors: XMind Ltd. -
 * initial API and implementation
 *******************************************************************************/
package org.xmind.ui.internal.actions;

import org.eclipse.jface.viewers.ISelection;
import org.xmind.gef.ui.actions.ISelectionAction;
import org.xmind.gef.ui.actions.RequestAction;
import org.xmind.gef.ui.editor.IGraphicalEditorPage;
import org.xmind.ui.actions.MindMapActionFactory;
import org.xmind.ui.internal.MindMapMessages;
import org.xmind.ui.mindmap.IMindMapImages;
import org.xmind.ui.mindmap.MindMapUI;
import org.xmind.ui.util.MindMapUtils;

public class InsertTopicBeforeAction extends RequestAction
        implements ISelectionAction {

    public InsertTopicBeforeAction(IGraphicalEditorPage page) {
        super(MindMapActionFactory.INSERT_TOPIC_BEFORE.getId(), page,
                MindMapUI.REQ_CREATE_BEFORE);
        setText(MindMapMessages.InsertTopicBefore_text);
        setToolTipText(MindMapMessages.InsertTopicBefore_toolTip);
        setImageDescriptor(
                MindMapUI.getImages().get(IMindMapImages.INSERT_BEFORE, true));
        setDisabledImageDescriptor(
                MindMapUI.getImages().get(IMindMapImages.INSERT_BEFORE, false));
    }

    public void setSelection(ISelection selection) {
        setEnabled(MindMapUtils.isSingleTopic(selection)
                && !MindMapUtils.hasCentralTopic(selection, getViewer())
                && !MindMapUtils.hasSuchElements(selection,
                        MindMapUI.CATEGORY_SUMMARY));
    }

}
